While visiting a museum on our favorite German island Borkum in the North Sea a showcase with thousands of glass bottles came to my eyes. Each of them was filled with sand. Each bottle had the name of the origin beach on it. The islands ranged from Sylt over Mallorca to Hawaii, islands in the black sea, the Caspian sea, the Caribbean ocean, the Atlantic ocean to the Pacific ocean over beaches and bays in the North Sea, Baltic Sea and Mediterranean,...